/Engine/Source/Runtime/Engine/Classes/Kismet/GameplayStatics.h
Counts how many grass foliage instances overlap a given sphere.
Number of foliage instances with their mesh set to Mesh that overlap the sphere.
static int32 GrassOverlappingSphereCount ( const [UObject](API\Runtime\CoreUObject\UObject\UObject) * WorldContextObject, const [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * StaticMesh, FVector CenterPosition, float Radius )